#include <bits/stdc++.h>

using namespace std;
char s[4000005], Pi[4000005];
long long counter, raspuns[1001];
void KMP (int lungime, int n)
{
    for (int i = 2; i<=n; ++i)
    {
        Pi[i] = Pi[i-1];
        while (Pi[i] && s[Pi[i]+1] != s[i]) Pi[i] = Pi[Pi[i]];
        if (s[i] == s[Pi[i]+1])
            ++Pi[i];
        if (Pi[i] == lungime)
        {
            ++counter;
            if (counter <= 1000)
                raspuns[counter] = i-2*lungime-1;
        }
    }
}
int main()
{
    freopen ("strmatch.in", "r", stdin);
    freopen ("strmatch.out", "w", stdout);
    long long n, len;
    cin >> (s+1);
    len = strlen(s+1);
    s[len+1] = '#';
    cin >> (s+len+2);
    n = strlen(s+1);
    KMP(len, n);
    cout << counter << '\n';
    for (int i = 1; i<=counter && i <=1000; ++i)
        cout << raspuns[i] << " ";
    return 0;
}